diff --git a/jedi/evaluate/finder.py b/jedi/evaluate/finder.py
index 4c6eade5..f278e264 100644
--- a/jedi/evaluate/finder.py
+++ b/jedi/evaluate/finder.py
@@ -439,11 +439,11 @@ def check_flow_information(evaluator, flow, search_name_part, pos):
         return None
 
     result = []
-    if False and flow.is_scope():
+    if flow.is_scope():
         for ass in reversed(flow.asserts):
             if pos is None or ass.start_pos > pos:
                 continue
-            result = _check_isinstance_type(evaluator, ass, search_name_part)
+            result = _check_isinstance_type(evaluator, ass.assertion(), search_name_part)
             if result:
                 break
 
@@ -473,20 +473,6 @@ def _check_isinstance_type(evaluator, element, search_name):
         # Do a simple get_code comparison. They should just have the same code,
         # and everything will be all right.
         classes = lst[1][1][0]
-        """
-        assert arglist.type == 'arglist' and len(arglist.children) in (3, 4)
-        isinst = call.next.values
-        assert len(isinst) == 2  # has two params
-        obj, classes = [statement.expression_list() for statement in isinst]
-        assert len(obj) == 1
-        assert len(classes) == 1
-        assert isinstance(obj[0], pr.Call)
-
-        while prev.previous is not None:
-            prev = prev.previous
-        assert obj[0].get_code() == prev.get_code()
-        assert isinstance(classes[0], pr.StatementElement)  # can be type or tuple
-        """
         call = helpers.call_of_name(search_name)
         assert name.get_code() == call.get_code()
     except AssertionError:
diff --git a/jedi/parser/__init__.py b/jedi/parser/__init__.py
index 45bace33..51b7ab82 100644
--- a/jedi/parser/__init__.py
+++ b/jedi/parser/__init__.py
@@ -94,7 +94,7 @@ class Parser(object):
             'pass_stmt': pt.KeywordStatement,
             'global_stmt': pt.GlobalStmt,
             'nonlocal_stmt': pt.KeywordStatement,
-            'assert_stmt': pt.KeywordStatement,
+            'assert_stmt': pt.AssertStmt,
             'if_stmt': pt.IfStmt,
             'with_stmt': pt.WithStmt,
             'for_stmt': pt.ForStmt,
diff --git a/jedi/parser/tree.py b/jedi/parser/tree.py
index 4cb933c1..2043e0a8 100644
--- a/jedi/parser/tree.py
+++ b/jedi/parser/tree.py
@@ -468,12 +468,11 @@ class Scope(Simple, DocstringMixin):
     :param start_pos: The position (line and column) of the scope.
     :type start_pos: tuple(int, int)
     """
-    __slots__ = ('_doc_token', 'asserts', 'names_dict')
+    __slots__ = ('_doc_token', 'names_dict')
 
     def __init__(self, children):
         super(Scope, self).__init__(children)
         self._doc_token = None
-        self.asserts = []
 
     @property
     def returns(self):
@@ -481,6 +480,12 @@ class Scope(Simple, DocstringMixin):
         # returns will be in "normal" modules.
         return self._search_in_scope(ReturnStmt)
 
+    @property
+    def asserts(self):
+        # Needed here for fast_parser, because the fast_parser splits and
+        # returns will be in "normal" modules.
+        return self._search_in_scope(AssertStmt)
+
     @property
     def subscopes(self):
         return self._search_in_scope(Scope)
@@ -1095,12 +1100,17 @@ class KeywordStatement(Simple):
         return self.children[0].value
 
 
-class GlobalStmt(Simple):
+class AssertStmt(KeywordStatement):
+    def assertion(self):
+        return self.children[1]
+
+
+class GlobalStmt(KeywordStatement):
     def get_defined_names(self):
         return self.children[1::2]
 
 
-class ReturnStmt(Simple):
+class ReturnStmt(KeywordStatement):
     pass